Refrigerated heating circulator HRHC series

for high temperatures

Product name
Refrigerating Heating Circulator

Application
HRHC series Hermetic Refrigerating & Heating Circulator (Dynamic Temperature Control systems) can be connected for Reactor Systems, Autoclaves, Pilot Systems, Mini Plant Systems, Scale-up for Operational Development, Double-wall reactors, Advanced-Flow Reactors, Distillation Systems, Material Testing, Combinational Chemistry, Semiconductor Industry, Vacuum Chambers.

Advantages & Functions

• Hermetic circulation system ensures high accuracy of temperature and extends lifetime of circulating liquid.
• Wide working temperature range (models cover ranges from very low up to high temperatures) without cooling fluid change.
• Intelligent PID temperature control.
• High stability and reproducibility of process.
• Adopted plate heat exchanger and optimized heating pipeline to improve heating & cooling rates.
• Cooling power range from small to very large (typical range examples from ~0.25 kW up to 15 kW depending on model).
• Optional large TFT touch screens (4", 7", 10") with graphic display available.
• Comprehensive warning and safety functions.
• Rapid cooling down from high temperature (e.g., from 300°C).
• Optional control software enables communication over long distance (up to ~200 m) for remote monitoring and data logging.
• Compact design relative to capacity.

Structure design
A fully closed piping design is used. A high-efficiency plate heat exchanger reduces demand for thermal fluid while enabling rapid temperature changes. The whole system is a closed liquid circulation system with an expansion container; circulation is adiabatic and mechanically sealed so that regardless of high or low jacket temperatures the expansion container temperature is limited (e.g., to 60°C). Key advantages:

• Only the heat conduction medium in the expansion container touches air oxygen (container limited to ~60°C) reducing risk of oxidation and volatilization.
• No volatilization of the heat conduction medium at high temperature.
• No need to change heat conduction medium for continuous operation across broad ranges (examples cited: -80°C~190°C, -70°C~220°C, -88°C~170°C, -55°C~250°C, -30°C~300°C) without pressure rise.

Display function

• Display of all process control temperatures.
• Liquid level indicator of heat conduction medium in expansion vessel.
• Indication of refrigeration system working status.
• Indication of heater working status.
• Indication of circulation pump working status.
• Selectable temperature control mode (material vs heat transfer medium).
• Settable upper and lower temperature limits.
• Settable temperature difference between jacket and reactor material.
• Alarm for low/empty liquid level.
• Compressor manual/automatic operation setting.
• Clear temperature-curve display with zoom and export capability.
• Recipe procedure setting and alarm note display.

Principle of process control
The system uses a two-loop PID control structure (master and slave loops) with feedforward. The master PID loop output combined with feedforward PV signals forms the setpoint for the secondary loop, minimizing lag and overshoot and ensuring accurate temperature gradients and fast response.

High repeatability
Designed for high repeatability of results and fine control accuracy (high-precision PID, closed-loop control and optimized components).

Circulation pump
High-temperature-resistant magnetic drive pumps or leak-free shield-driven pumps are used to reduce leakage risk. The pumps are chosen for low noise and high flow rates suitable for the model's capacity and pressure requirements.

Electronic expansion valve
Dynamic temperature control systems can be fitted with an electronic expansion valve (Emerson) to precisely control refrigerant flow; step control up to ~750 steps/min provides improved control accuracy.

Configuration software (optional)

• Computer connection (communication distance up to ~200 m).
• Install and record display pictures on a computer via software.
• Easy temperature setting, real-time control screen, curve records, program selection and alarm recording.

Safety protection
Multiple safety features and self-diagnosis: phase sequence detection, leakage protection, refrigeration high/low voltage protection, pump overload, compressor overload, high/low liquid level, two independent over-temperature protections, water protections, circulation-line shut protection and alarm display on touch screen.

Connecting pipe (examples)
Items / Temp. range / Interface port
- Fluorine rubber hose / -30~200°C / Φ12×16; Φ16×22; Φ20×26
- Metal insulation pipe / -60~250°C / DN15; DN20; DN25; M24×1.5; M30×1.5; M38×1.5

Data interface & software (standard)

• PT100 temperature sensor inputs.
• USB data export interfaces.
• RS485 interface (MODBUS RTU).
• Alarm contact output.

Heat conduction medium
Selection of suitable heat conduction medium is important to ensure stable operation. LABFREEZ offers heat conduction medium in packaging sizes 10L, 25L, 30L, 200L for use with the system and external circulation equipment.

Optional features

• 4~20mA temperature measurement input.
• 4~20mA temperature setting input.
• Ethernet interface.
• RS232 interface (MODBUS protocol).
• Computer operating software (requires Ethernet interface).
• External control box with touch-screen display.

Typical applications / example integration
Connection examples include glass reactors, multi-reactor setups, pilot plants and process-distillation configurations where precise dynamic temperature control is required.

Caractéristiques / spécifications techniques

• Series: HRHC Series (Hermetic Refrigerating & Heating Circulators).
• Temperature control method: Feedforward + PID with PLC; dual-loop (master/slave) control; recipe/program support (e.g., 20 programs, up to 45 segments per program).
• Temperature range (example series capability): models cover up to -50°C ~ +250°C (other HRHC variants on site show ranges such as -70°C, -80°C etc depending on model).
• Temperature accuracy: typically ±1°C (model dependent).
• Heating power (examples by model): from ~2.5 kW to 15 kW (e.g., 2500W, 3500W, 5500W, 7500W, 10000W, 15000W depending on model).
• Cooling capacity (examples): capacity values vary by model and temperature point; listed cooling capacities range from ~250W up to 15,000W depending on model and reference temperature.
• Circulation pump (examples): flow up to ~110 L/min and pressure up to ~2.5 bar for largest models; smaller units typical Max 20–50 L/min at ~2–2.5 bar.
• Compressor brands (typical): Tecumseh or Copeland depending on model/size.
• Expansion valve: Danfoss (electronic expansion valve option: Emerson electronic valve for fine control).
• Evaporator: KAORI plate heat exchanger used in many units.
• Refrigerant (typical): R-404A (model dependent).
• Connection sizes (examples): DN15 / DN20 / DN25 or metric threaded M24×1.5, M30×1.5, M38×1.5; fluorine rubber hose options: Φ12×16, Φ16×22, Φ20×26.
• Dimensions & weights: vary by model — typical footprints example (water-cooled): 400×600×1050 mm up to 700×700×1250 mm; air-cooled larger sizes shown ~550×680×1450 mm etc. Weights range approx. 160 kg to 360 kg (water-cooled examples) up to larger air-cooled units (examples 280–360 kg).
• Power supply examples: AC 220V 50Hz (small); typical larger models AC 380V 50Hz with maximum rated power up to ~24 kW (model dependent).
• Control panel: 7" color touch screen (temperature curve display & record); other screen sizes optional.
• Communication protocols: MODBUS RTU over RS485 standard; optional RS232, Ethernet; USB export.
• Safety: multiple protections (high/low pressure, overload, level, dual over-temperature, leak/phase protections).